Calipers.



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fm, WQTA/ H. J. REP?. GALIPBBS. APPLIOATION'IILED NOV. 29, 1907.

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Patented Dec.`22, 1908.

ljlllllllll'lIMIIIHIIHIQIIHIHIlllllmllllllnlulullm|n HOMER J. REPP, OFTOPEKA, KANSAS.

CALIPERS.

Specication of Letters Patent.

Patented Dec. 22, 1908.

Application led November 29, 1907. Serial No. 404,197.

To all whom it may concern:

Be it known that I, HOMER J REPP, a citi- Zen of the United States,residing at Topeka, in the county of Shawnee and State of Kansas, haveinvented certain new and useful Improvements in Calipers, of which thefollowing is a specication.

My invention relates to tools and refers particularly to that class ofmeasuring instruments termed calipers.

The chief objects of my improvements are to provide a caliper-compasswith an indicating scale for registering the measurements taken with theinstrument; to furnish a convenient mechanism for opening and closingthe jaws to supply a tool of neat appearance and presenting a smoothoutline and to supply a protective covering for the working parts, thustting the instrument for pocket use.

,l Further objects of my invention are to furnish a compensating devicefor the lost motion caused by wear, to furnish means for locking thejaws when adjusted, and to produce a simple, durable and accurateappliance for the purposes to which such tools are applicable.

accomplish the objects sought by means of the instrument illustrated inthe accompanying drawing which forms a part of this application, and inwhich Figure 1 is a side elevation of the complete instrument furnishedwith jaws adapted for outside work; Fig. 2 is an edge view of Fig. 1;Fig. 3 is a view similar to Fig. 1, with one of the housing platesremoved, some parts being in section; Fig. 4 is a side view of a jawadapted for inside measurements and provided with a modificationdesigned to compensate for wear; Fig. 5 is'an enlarged view showing thewasher a plied to the stem of the operating screw, the atter being insection, and Fig. 6 is an edge view of the housing plates removed fromthe tool.

Referring more in detail to the drawing, the numeral 10 indicates thehead of an operating screw, provided with' a milled surface 11. Formedintegral with the head is a cone shaped collar 12 which en ages the endof a housing composed of dup icate plates each late consisting ofsemi-tubular parts 13, 13 a, aving laterally extending wings 16,triangular in outline. One end of the housing plates have flanges 14which are notched to receive the body of the said operating screw, theirmargin being in apposition, thus forming a bearing for the end of thescrew farthest from the head. The opposite ends of the housing platesare furnished with semi-cone-shaped anges 15 which have a smaller radiusof curvature than the semi-tubular portions of the plates, thusproducing shoulders 15a. rlhe ianges 15 are in apposition when the partsare assembled forming a complete coneshaped collar which is covered bythe collar 12 as by a cap the free margin of the said collar 12 engagingthe shoulders 15a. The combined lianges 15 thus form a conical bearingupon which the screw turns when operated by the milled head 10. The bodyof said operating screw is furnished with threads 17 and the point 18 ofthe screw is reduced in size and threaded, and has upon one side aspline or key-way 19, in which is received a lug or key 20 formed in awasher 21, said Washer being held against the flanged portion 14 of thetubular part of the housing by means of a set nut 22.

Caliper jaws 23 of the usual form are received between the housingplates and are pivoted to the triangular Wings 16 by rivets or pivotscrews 24. The ends of the jaws thus secured to the housing are curvedalong the margin in apposition with the screw 17 said'curve having thepivot 24 for a center, and are furnished with teeth 25 adapted to beengagedby said operating screw. By this arrangement the position of thejaws will be governed by turning the screw which may be properly termeda worm, and the toothed jaw ends meshing therewith segment wormgears.

In Fig. 4 is shown a modified form of jaw 26 having a hole at 27 for apivot and adapted for inside measurements. In this form the worm-gearteeth 25EL are formed in a separate piece 28, pivoted to the main partof the jaw at 28a. A flat spring 29 is inserted in notches in the twoparts of the aw and serves to take up the wear in the teeth.

The outer surface of the conical collar 12 is furnished with graduations12a and upon one side of the tubular casing is placed an index mark 30by means of which the angular movement of the screw and thecorresponding interval between the working faces of the free ends of thejaws may be determined. The graduations may be calibrated to registerinches or any other scale desired.

The structure and arrangement of the parts thus shown and describedproduce a compact and efcient tool, the operating worm constitutes amicrometer screw by the manipulation of which iine adjustments may bemade, and the method of rictionally holding the parts in adjustedposition by the set nut all combining to furnish a device of greatutility.

What l claim as new, is t 1. rlhe combination with a two-part tubularcasing, jaws pivoted between said parts, segment gears on said jaws, andhoused in said casing, and a screw mounted in said housing and meshingwith said gears, of a conical collar on said screw and engaging saidhousing, said collar having graduations thereon and said housing havingan indicating mark thereon, and means for locking said screw againstrotation.

2. The combination of a housing compassjaws pivoted to said housing,segment gears attached to. said jaws, a worm screw journaled insaidhousing and meshing with said gears, compensating means for lost motionin the gears, means for registering the angle of rotation of said screwfrom the initial point, and means for securing the parts in adjustedposition.

3. The combination with a tubular housing, a conical flange attached tothe housing, jaws pivoted to the housing, segment gears for the jaws,and a worm screw journaled in said housing, and meshing with said gears,of a conical collar attached to said screw and engaging the said conicalflange, said collar provided with graduations.

In testimony whereof l affix my signature in the presence of twowitnesses.

HOMER J. REPP.

Witnesses:

D. P. PAXTON, W. S. DARBY.

